﻿// Scintilla source code edit control
/** @file LineMarker.cxx
 ** Defines the look of a line marker in the margin.
 **/
// Copyright 1998-2011 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#include <cstring>
#include <cmath>

#include <stdexcept>
#include <string>
#include <string_view>
#include <vector>
#include <map>
#include <algorithm>
#include <memory>

#include "Platform.h"

#include "Scintilla.h"

#include "IntegerRectangle.h"
#include "XPM.h"
#include "LineMarker.h"

using namespace Scintilla;

LineMarker::LineMarker(const LineMarker &other) {
	// Defined to avoid pxpm and image being blindly copied, not as a complete copy constructor.
	markType = other.markType;
	fore = other.fore;
	back = other.back;
	backSelected = other.backSelected;
	alpha = other.alpha;
	if (other.pxpm)
		pxpm = std::make_unique<XPM>(*other.pxpm);
	else
		pxpm = nullptr;
	if (other.image)
		image = std::make_unique<RGBAImage>(*other.image);
	else
		image = nullptr;
	customDraw = other.customDraw;
}

LineMarker &LineMarker::operator=(const LineMarker &other) {
	// Defined to avoid pxpm and image being blindly copied, not as a complete assignment operator.
	if (this != &other) {
		markType = other.markType;
		fore = other.fore;
		back = other.back;
		backSelected = other.backSelected;
		alpha = other.alpha;
		if (other.pxpm)
			pxpm = std::make_unique<XPM>(*other.pxpm);
		else
			pxpm = nullptr;
		if (other.image)
			image = std::make_unique<RGBAImage>(*other.image);
		else
			image = nullptr;
		customDraw = other.customDraw;
	}
	return *this;
}

void LineMarker::SetXPM(const char *textForm) {
	pxpm = std::make_unique<XPM>(textForm);
	markType = SC_MARK_PIXMAP;
}

void LineMarker::SetXPM(const char *const *linesForm) {
	pxpm = std::make_unique<XPM>(linesForm);
	markType = SC_MARK_PIXMAP;
}

void LineMarker::SetRGBAImage(Point sizeRGBAImage, float scale, const unsigned char *pixelsRGBAImage) {
	image = std::make_unique<RGBAImage>(static_cast<int>(sizeRGBAImage.x), static_cast<int>(sizeRGBAImage.y), scale, pixelsRGBAImage);
	markType = SC_MARK_RGBAIMAGE;
}

static void DrawBox(Surface *surface, int centreX, int centreY, int armSize, ColourDesired fore, ColourDesired back) {
	const PRectangle rc = PRectangle::FromInts(
				      centreX - armSize,
				      centreY - armSize,
				      centreX + armSize + 1,
				      centreY + armSize + 1);
	surface->RectangleDraw(rc, back, fore);
}

static void DrawCircle(Surface *surface, int centreX, int centreY, int armSize, ColourDesired fore, ColourDesired back) {
	const PRectangle rcCircle = PRectangle::FromInts(
					    centreX - armSize,
					    centreY - armSize,
					    centreX + armSize + 1,
					    centreY + armSize + 1);
	surface->Ellipse(rcCircle, back, fore);
}

static void DrawPlus(Surface *surface, int centreX, int centreY, int armSize, ColourDesired fore) {
	const PRectangle rcV = PRectangle::FromInts(centreX, centreY - armSize + 2, centreX + 1, centreY + armSize - 2 + 1);
	surface->FillRectangle(rcV, fore);
	const PRectangle rcH = PRectangle::FromInts(centreX - armSize + 2, centreY, centreX + armSize - 2 + 1, centreY + 1);
	surface->FillRectangle(rcH, fore);
}

static void DrawMinus(Surface *surface, int centreX, int centreY, int armSize, ColourDesired fore) {
	const PRectangle rcH = PRectangle::FromInts(centreX - armSize + 2, centreY, centreX + armSize - 2 + 1, centreY + 1);
	surface->FillRectangle(rcH, fore);
}

void LineMarker::Draw(Surface *surface, PRectangle &rcWhole, Font &fontForCharacter, FoldPart part, int marginStyle) const {
	if (customDraw) {
		customDraw(surface, rcWhole, fontForCharacter, static_cast<int>(part), marginStyle, this);
		return;
	}

	ColourDesired colourHead = back;
	ColourDesired colourBody = back;
	ColourDesired colourTail = back;

	switch (part) {
	case FoldPart::head:
	case FoldPart::headWithTail:
		colourHead = backSelected;
		colourTail = backSelected;
		break;
	case FoldPart::body:
		colourHead = backSelected;
		colourBody = backSelected;
		break;
	case FoldPart::tail:
		colourBody = backSelected;
		colourTail = backSelected;
		break;
	default:
		// FoldPart::undefined
		break;
	}

	if ((markType == SC_MARK_PIXMAP) && (pxpm)) {
		pxpm->Draw(surface, rcWhole);
		return;
	}
	if ((markType == SC_MARK_RGBAIMAGE) && (image)) {
		// Make rectangle just large enough to fit image centred on centre of rcWhole
		PRectangle rcImage;
		rcImage.top = ((rcWhole.top + rcWhole.bottom) - image->GetScaledHeight()) / 2;
		rcImage.bottom = rcImage.top + image->GetScaledHeight();
		rcImage.left = ((rcWhole.left + rcWhole.right) - image->GetScaledWidth()) / 2;
		rcImage.right = rcImage.left + image->GetScaledWidth();
		surface->DrawRGBAImage(rcImage, image->GetWidth(), image->GetHeight(), image->Pixels());
		return;
	}

	const IntegerRectangle ircWhole(rcWhole);
	// Restrict most shapes a bit
	const PRectangle rc(rcWhole.left, rcWhole.top + 1, rcWhole.right, rcWhole.bottom - 1);
	// Ensure does not go beyond edge
	const int minDim = std::min(ircWhole.Width(), ircWhole.Height() - 2) - 1;
	int centreX = (ircWhole.right + ircWhole.left) / 2;
	const int centreY = (ircWhole.bottom + ircWhole.top) / 2;
	const int dimOn2 = minDim / 2;
	const int dimOn4 = minDim / 4;
	const int blobSize = dimOn2 - 1;
	const int armSize = dimOn2 - 2;
	if (marginStyle == SC_MARGIN_NUMBER || marginStyle == SC_MARGIN_TEXT || marginStyle == SC_MARGIN_RTEXT) {
		// On textual margins move marker to the left to try to avoid overlapping the text
		centreX = ircWhole.left + dimOn2 + 1;
	}

	switch (markType) {
	case SC_MARK_ROUNDRECT: {
			PRectangle rcRounded = rc;
			rcRounded.left = rc.left + 1;
			rcRounded.right = rc.right - 1;
			surface->RoundedRectangle(rcRounded, fore, back);
		}
		break;

	case SC_MARK_CIRCLE: {
			const PRectangle rcCircle = PRectangle::FromInts(
							    centreX - dimOn2,
							    centreY - dimOn2,
							    centreX + dimOn2,
							    centreY + dimOn2);
			surface->Ellipse(rcCircle, fore, back);
		}
		break;

	case SC_MARK_ARROW: {
			Point pts[] = {
				Point::FromInts(centreX - dimOn4, centreY - dimOn2),
				Point::FromInts(centreX - dimOn4, centreY + dimOn2),
				Point::FromInts(centreX + dimOn2 - dimOn4, centreY),
			};
			surface->Polygon(pts, std::size(pts), fore, back);
		}
		break;

	case SC_MARK_ARROWDOWN: {
			Point pts[] = {
				Point::FromInts(centreX - dimOn2, centreY - dimOn4),
				Point::FromInts(centreX + dimOn2, centreY - dimOn4),
				Point::FromInts(centreX, centreY + dimOn2 - dimOn4),
			};
			surface->Polygon(pts, std::size(pts), fore, back);
		}
		break;

	case SC_MARK_PLUS: {
			Point pts[] = {
				Point::FromInts(centreX - armSize, centreY - 1),
				Point::FromInts(centreX - 1, centreY - 1),
				Point::FromInts(centreX - 1, centreY - armSize),
				Point::FromInts(centreX + 1, centreY - armSize),
				Point::FromInts(centreX + 1, centreY - 1),
				Point::FromInts(centreX + armSize, centreY - 1),
				Point::FromInts(centreX + armSize, centreY + 1),
				Point::FromInts(centreX + 1, centreY + 1),
				Point::FromInts(centreX + 1, centreY + armSize),
				Point::FromInts(centreX - 1, centreY + armSize),
				Point::FromInts(centreX - 1, centreY + 1),
				Point::FromInts(centreX - armSize, centreY + 1),
			};
			surface->Polygon(pts, std::size(pts), fore, back);
		}
		break;

	case SC_MARK_MINUS: {
			Point pts[] = {
				Point::FromInts(centreX - armSize, centreY - 1),
				Point::FromInts(centreX + armSize, centreY - 1),
				Point::FromInts(centreX + armSize, centreY + 1),
				Point::FromInts(centreX - armSize, centreY + 1),
			};
			surface->Polygon(pts, std::size(pts), fore, back);
		}
		break;

	case SC_MARK_SMALLRECT: {
			PRectangle rcSmall;
			rcSmall.left = rc.left + 1;
			rcSmall.top = rc.top + 2;
			rcSmall.right = rc.right - 1;
			rcSmall.bottom = rc.bottom - 2;
			surface->RectangleDraw(rcSmall, fore, back);
		}
		break;

	case SC_MARK_EMPTY:
	case SC_MARK_BACKGROUND:
	case SC_MARK_UNDERLINE:
	case SC_MARK_AVAILABLE:
		// An invisible marker so don't draw anything
		break;

	case SC_MARK_VLINE: {
			surface->PenColour(colourBody);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, ircWhole.bottom);
		}
		break;

	case SC_MARK_LCORNER: {
			surface->PenColour(colourTail);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, centreY);
			surface->LineTo(ircWhole.right - 1, centreY);
		}
		break;

	case SC_MARK_TCORNER: {
			surface->PenColour(colourTail);
			surface->MoveTo(centreX, centreY);
			surface->LineTo(ircWhole.right - 1, centreY);

			surface->PenColour(colourBody);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, centreY + 1);

			surface->PenColour(colourHead);
			surface->LineTo(centreX, ircWhole.bottom);
		}
		break;

	case SC_MARK_LCORNERCURVE: {
			surface->PenColour(colourTail);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, centreY - 3);
			surface->LineTo(centreX + 3, centreY);
			surface->LineTo(ircWhole.right - 1, centreY);
		}
		break;

	case SC_MARK_TCORNERCURVE: {
			surface->PenColour(colourTail);
			surface->MoveTo(centreX, centreY - 3);
			surface->LineTo(centreX + 3, centreY);
			surface->LineTo(ircWhole.right - 1, centreY);

			surface->PenColour(colourBody);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, centreY - 2);

			surface->PenColour(colourHead);
			surface->LineTo(centreX, ircWhole.bottom);
		}
		break;

	case SC_MARK_BOXPLUS: {
			DrawBox(surface, centreX, centreY, blobSize, fore, colourHead);
			DrawPlus(surface, centreX, centreY, blobSize, fore);
		}
		break;

	case SC_MARK_BOXPLUSCONNECTED: {
			if (part == FoldPart::headWithTail)
				surface->PenColour(colourTail);
			else
				surface->PenColour(colourBody);
			surface->MoveTo(centreX, centreY + blobSize);
			surface->LineTo(centreX, ircWhole.bottom);

			surface->PenColour(colourBody);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, centreY - blobSize);

			DrawBox(surface, centreX, centreY, blobSize, fore, colourHead);
			DrawPlus(surface, centreX, centreY, blobSize, fore);

			if (part == FoldPart::body) {
				surface->PenColour(colourTail);
				surface->MoveTo(centreX + 1, centreY + blobSize);
				surface->LineTo(centreX + blobSize + 1, centreY + blobSize);

				surface->MoveTo(centreX + blobSize, centreY + blobSize);
				surface->LineTo(centreX + blobSize, centreY - blobSize);

				surface->MoveTo(centreX + 1, centreY - blobSize);
				surface->LineTo(centreX + blobSize + 1, centreY - blobSize);
			}
		}
		break;

	case SC_MARK_BOXMINUS: {
			DrawBox(surface, centreX, centreY, blobSize, fore, colourHead);
			DrawMinus(surface, centreX, centreY, blobSize, fore);

			surface->PenColour(fore);
			surface->MoveTo(centreX, centreY + blobSize);
			surface->LineTo(centreX, ircWhole.bottom);
		}
		break;

	case SC_MARK_BOXMINUSCONNECTED: {
			DrawBox(surface, centreX, centreY, blobSize, fore, colourHead);
			DrawMinus(surface, centreX, centreY, blobSize, fore);

			surface->PenColour(fore);
			surface->MoveTo(centreX, centreY + blobSize);
			surface->LineTo(centreX, ircWhole.bottom);

			surface->PenColour(colourBody);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, centreY - blobSize);

			if (part == FoldPart::body) {
				surface->PenColour(colourTail);
				surface->MoveTo(centreX + 1, centreY + blobSize);
				surface->LineTo(centreX + blobSize + 1, centreY + blobSize);

				surface->MoveTo(centreX + blobSize, centreY + blobSize);
				surface->LineTo(centreX + blobSize, centreY - blobSize);

				surface->MoveTo(centreX + 1, centreY - blobSize);
				surface->LineTo(centreX + blobSize + 1, centreY - blobSize);
			}
		}
		break;

	case SC_MARK_CIRCLEPLUS: {
			DrawCircle(surface, centreX, centreY, blobSize, fore, colourHead);
			DrawPlus(surface, centreX, centreY, blobSize, colourTail);
		}
		break;

	case SC_MARK_CIRCLEPLUSCONNECTED: {
			if (part == FoldPart::headWithTail)
				surface->PenColour(colourTail);
			else
				surface->PenColour(colourBody);
			surface->MoveTo(centreX, centreY + blobSize);
			surface->LineTo(centreX, ircWhole.bottom);

			surface->PenColour(colourBody);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, centreY - blobSize);

			DrawCircle(surface, centreX, centreY, blobSize, fore, colourHead);
			DrawPlus(surface, centreX, centreY, blobSize, colourTail);
		}
		break;

	case SC_MARK_CIRCLEMINUS: {
			surface->PenColour(colourHead);
			surface->MoveTo(centreX, centreY + blobSize);
			surface->LineTo(centreX, ircWhole.bottom);

			DrawCircle(surface, centreX, centreY, blobSize, fore, colourHead);
			DrawMinus(surface, centreX, centreY, blobSize, colourTail);
		}
		break;

	case SC_MARK_CIRCLEMINUSCONNECTED: {
			surface->PenColour(colourHead);
			surface->MoveTo(centreX, centreY + blobSize);
			surface->LineTo(centreX, ircWhole.bottom);

			surface->PenColour(colourBody);
			surface->MoveTo(centreX, ircWhole.top);
			surface->LineTo(centreX, centreY - blobSize);

			DrawCircle(surface, centreX, centreY, blobSize, fore, colourHead);
			DrawMinus(surface, centreX, centreY, blobSize, colourTail);
		}
		break;

	case SC_MARK_DOTDOTDOT: {
			XYPOSITION right = static_cast<XYPOSITION>(centreX - 6);
			for (int b = 0; b < 3; b++) {
				const PRectangle rcBlob(right, rc.bottom - 4, right + 2, rc.bottom - 2);
				surface->FillRectangle(rcBlob, fore);
				right += 5.0f;
			}
		}
		break;

	case SC_MARK_ARROWS: {
			surface->PenColour(fore);
			int right = centreX - 2;
			const int armLength = dimOn2 - 1;
			for (int b = 0; b < 3; b++) {
				surface->MoveTo(right, centreY);
				surface->LineTo(right - armLength, centreY - armLength);
				surface->MoveTo(right, centreY);
				surface->LineTo(right - armLength, centreY + armLength);
				right += 4;
			}
		}
		break;

	case SC_MARK_SHORTARROW: {
			Point pts[] = {
				Point::FromInts(centreX, centreY + dimOn2),
				Point::FromInts(centreX + dimOn2, centreY),
				Point::FromInts(centreX, centreY - dimOn2),
				Point::FromInts(centreX, centreY - dimOn4),
				Point::FromInts(centreX - dimOn4, centreY - dimOn4),
				Point::FromInts(centreX - dimOn4, centreY + dimOn4),
				Point::FromInts(centreX, centreY + dimOn4),
				Point::FromInts(centreX, centreY + dimOn2),
			};
			surface->Polygon(pts, std::size(pts), fore, back);
		}
		break;

	case SC_MARK_FULLRECT:
		surface->FillRectangle(rcWhole, back);
		break;

	case SC_MARK_LEFTRECT: {
			PRectangle rcLeft = rcWhole;
			rcLeft.right = rcLeft.left + 4;
			surface->FillRectangle(rcLeft, back);
		}
		break;

	case SC_MARK_BOOKMARK: {
			const int halfHeight = minDim / 3;
			Point pts[] = {
				Point::FromInts(ircWhole.left, centreY - halfHeight),
				Point::FromInts(ircWhole.right - 3, centreY - halfHeight),
				Point::FromInts(ircWhole.right - 3 - halfHeight, centreY),
				Point::FromInts(ircWhole.right - 3, centreY + halfHeight),
				Point::FromInts(ircWhole.left, centreY + halfHeight),
			};
			surface->Polygon(pts, std::size(pts), fore, back);
		}
		break;

	case SC_MARK_VERTICALBOOKMARK: {
			const int halfWidth = minDim / 3;
			Point pts[] = {
				Point::FromInts(centreX - halfWidth, centreY - dimOn2),
				Point::FromInts(centreX + halfWidth, centreY - dimOn2),
				Point::FromInts(centreX + halfWidth, centreY + dimOn2),
				Point::FromInts(centreX, centreY + dimOn2 - halfWidth),
				Point::FromInts(centreX - halfWidth, centreY + dimOn2),
			};
			surface->Polygon(pts, std::size(pts), fore, back);
		}
		break;

	default:
		if (markType >= SC_MARK_CHARACTER) {
			std::string character(1, static_cast<char>(markType - SC_MARK_CHARACTER));
			const XYPOSITION width = surface->WidthText(fontForCharacter, character);
			PRectangle rcText = rc;
			rcText.left += (rc.Width() - width) / 2;
			rcText.right = rc.left + width;
			surface->DrawTextClipped(rcText, fontForCharacter, rcText.bottom - 2,
						 character, fore, back);
		} else {
			// treat as SC_MARK_FULLRECT
			surface->FillRectangle(rcWhole, back);
		}
		break;
	}
}
